# Simple problem

• November 14th 2009, 01:05 PM
gralla55
Simple problem
What's F'(x)? Is it just x^2-1 ?
• November 14th 2009, 01:22 PM
tonio
Quote:

Originally Posted by gralla55
What's F'(x)? Is it just x^2-1 ?

As F is a primitive of f, $F'(x)=f(x)=\ln(x^2-1)$

Tonio
• November 14th 2009, 01:23 PM
gralla55
Yes of course, that's what I thought and what I meant to write. Thanks!